p{
    text-align: left;
    font-size: 18px;
    margin-left: 20px;
}
.nav{
    border: 1px solid rgb(155, 155, 155);
    width: 420px;
    margin: 0 auto;
}
.main{
    border: 1px solid rgb(112, 112, 112);
    width: 420px;
    margin: 0 auto;
}
.menu{
    height: 40px;
    display: flex;
    line-height: 40px;
    justify-content: space-around;
    border-bottom: 1px solid #000;
}
a{
    font-size: 20px;
    font-weight: bolder;
    color: rgb(47, 0, 255);
    text-decoration: none;
    background-color: rgb(213, 255, 241);
}

.con1{
    display: none;
}
.con1:target{
    display: block;
}
.con2{
    display: none;
}
.con2:target{
    display: block;
}
.con3{
    display: none;
}
.con3:target{
    display: block;
}
.con4{
    display: none;
}
.con4:target{
    display: block;
}


